Electron Beam Inkjet Ink Composition for Low-Migration Image Quality
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Solution Overview
Problem
Existing image recording methods using electron beam curing struggle to achieve high image quality while suppressing migration of ink components from the recorded image.
Innovation Solution
An inkjet ink formulation containing a polymerization initiator with a molecular weight of 500 or more and limited to 2 mass% or less, along with specific polymerizable compounds and optional pigments, is used to ensure high image quality and minimize migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ink formulations are used for electron beam curing, then the ink can be cured to form an image, but the image quality is poor and migration of ink components occurs
Solution Approach 1:
The patent changes the molecular weight parameter of the polymerization initiator to 500 or more and controls its content to 0.1-2 mass%, which fundamentally alters the curing characteristics and reduces migration while improving image quality
Solution Approach 2:
The patent creates a composite ink formulation combining specific polymerization initiators (molecular weight ≥500) with polymerizable compounds and optional pigments, where the synergistic interaction between components achieves both high image quality and migration suppression
2Productivity
If the polymerization initiator content is increased to improve curing efficiency, then the curing speed increases, but migration of ink components worsens
Solution Approach 1:
The patent optimizes the polymerization initiator content parameter to a specific range of 0.1-2 mass%, which is lower than conventional formulations. This parameter optimization maintains adequate curing speed while significantly reducing migration of ink components
3Power
If the polymerization initiator molecular weight is decreased to improve reactivity, then the curing efficiency increases, but image quality deteriorates and migration increases
Solution Approach 1:
The patent inverts the conventional wisdom by setting the molecular weight parameter to 500 or more (higher than conventional initiators). This counterintuitive parameter change results in improved image quality and reduced migration while maintaining adequate curing efficiency through the specific combination with polymerizable compounds
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The ink formulation achieves high image quality with reduced migration, making it suitable for applications like food packaging, while maintaining ejectability and curability.
Implementation Method 1
an irradiation step of irradiating the curable composition with two or more kinds of actinic rays, wherein at least an electron beam with an acceleration voltage of 130 kV or less is used as one of the actinic rays
Implementation Method 2
a polymerization initiator (A) and a polymerizable compound (B)
Implementation Method 3
the polymerization initiator (A) includes a hydrogen abstraction type polymerization initiator
Data Source
AI summary
Provided are an inkjet ink for electron beam curing, an ink set, and an image recording method. The inkjet ink contains a polymerization initiator (A) and a polymerizable compound (B). The polymerization initiator (A) includes a hydrogen abstraction type polymerization initiator having a molecular weight of 500 or more, and the content of the polymerization initiator (A) is more than 0 mass% and 2 mass% or less relative to the total amount of the ink jet ink for electron beam curing.